JPS62157687A - Heating element and heating resin laminate using the same - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a heat generating element used for, for example, the seat and back of a chair, a toilet seat, a heat insulating floor, or a heat insulating tank of various heat insulators, and its heat generating body. The present invention relates to a heat-generating resin laminate using an element body.

"Prior Art" and "Problems to be Solved by the Invention" Conventionally, many types of sheet heating elements have been used as heating elements for electric floor heating and heat-retaining tatami mats as described in Publication of Utility Model Publication No. 58-25881. ing. In other words, these planar heating elements are made by screwing semiconductive material such as carbon powder into a base material such as synthetic resin to form a resistor, or by woven resistance wire such as nichrome wire into a base fabric. The structure is made of heat-resistant fiber cloth coated with specially processed carbon or carbon black, etc., and heat is generated from the surface of the material to heat or retain heat. ing.

However, the above-mentioned known examples lack thermal fi/V resistance and are prone to cracking due to repeated heating and cooling, and also use resistance wires such as nichrome wires as heating elements. However, in addition to causing rust and corrosion over time, it is also difficult to process the heating element itself into a curved surface.

The present invention provides a novel heating element that solves the above-mentioned conventional difficulties,
The purpose is to provide a heat-generating resin laminate using the same.

``Means for Solving the Problems'' The present invention, which achieves the above-mentioned objects, is based on the following features: ``Ribbon-shaped carbon fiber groups are freely arranged in series or parallel, and the carbon fiber groups are provided with conductive terminals. and a heating element characterized by a flexible film-like structure in which the carbon fiber group is sealed with a flexible epoxy resin, leaving only the conductive terminal; It is characterized by a heat-generating resin laminate with synthetic resin inner and outer panels laminated and fixed together on both sides.

``Function'' The heating element with the above structure has a flexible film shape in which conductive carbon fibers are sealed in flexible epoxy resin, so it has thermal shock resistance and temperature resistance against repeated heating and cooling. The heat-generating resin laminate, which has excellent heat-generating properties and electrical insulation properties, is suitable as a heat-generating wall of various shapes, including the curved surfaces of outdoor heating insulators and heat-retaining benches that are exposed to the outside air. It has the effect of improving performance.

"Examples" Hereinafter, the structure and operation of the present invention will be explained in detail with reference to Examples. With reference to FIG. 1 showing a heating element 1 of an embodiment of the present invention used as a heat source for the "seat" and "backrest" of an outdoor heat-retaining bench, the heating element 1 of the present invention is thin. Carbon fibers 2 in the form of elongated flexible ribbons are intertwined and arranged in a lattice pattern, and at both ends of the two groups of carbon fibers, conductive terminals are connected to terminals 4 that collectively form the groups of carbon fibers 2 arranged in parallel. 5 is connected and fixed.

The lattice-shaped carbon fibers 2 arranged in the manner described above are coated with a known flexible epoxy resin on the entire surface including the upper and lower surfaces as well as the left and right edges to form an insulating coating 8. , the carbon fibers 2 arranged in a lattice pattern form a conductive terminal 5.
It is a flexible film body that is sealed by being wrapped in an insulating coating 8 of flexible epoxy resin, with the exception of the epoxy resin. When, for example, a two-phase power source is connected to the conductive terminal 5, heat is generated due to the resistance heat of the carbon fibers 2.

The flexible epoxy resin of the heating element 1 in the example shown in FIG. ) and a curing agent of HY-806 (product symbol) (main component: modified heterocyclic polyamine, product name: Be-Cure). The mixed solution of the two components was applied to the entire surface of the carbon fiber group 2 and allowed to naturally cure (curing time: about 1.5 hours at 25° C.). The physical properties of the insulating coating 8 after curing are as follows: hardness (Shore)2Mn2, tensile strength: 18.8 kg/Crr.2, elongation at break: 102%, HTiL ratio (I Mn2): 4. 0
, dielectric loss tangent (IMHz): 0.096, dielectric breakdown strength (kv/mm): 12, boiling water absorption rate (2Hrs,
wt%): I Hr 2.4, volume resistivity (Q
-cm): 2.5×1ge0.

Next, a heat generating resin laminate using the heat generating element 1 described above will be explained. Referring to FIG. 2, which shows a cross section of one embodiment, the figure shows the "seat" and "
The heat-generating resin laminate 7 of the present invention is constructed with the heat-generating element 1 as a core. Inner plate 8 of synthetic resin plate
On the other side, a synthetic resin outer panel 9 is laminated and fixed together in a sandwich-like manner, and a heat insulating layer 10 is interposed between the heating element 1 and the outer panel 9. When electricity is applied to one conductive terminal 5, the carbon fibers 2 in the heating element 1 generate heat, and the inner plate 8 is heated.

In other words, considering the mechanical strength of the bench, the inner panel 8 and outer panel 9 are made of FRP boards (fiber-reinforced plastic boards) approximately 2 mm thick, which are made by laminating 2 plies of polyester μ resin and glass fiber. Now, on the back side of the inner plate 8, a large number of heat generating elements 1 are pasted side by side, and about 10 to 20 heat generating elements 1 made of urethane foam are attached on the back side of the group of pasted heat generating elements 1. An outer panel 9 is laminated and fixed with a heat insulating layer 10 having a millimeter μ thickness interposed therebetween, and an inner panel 8, a heating element 1, and a heat insulating layer 10 are assembled.
1 and the outer plate 9 are fixed together.

When the terminal 5 of the heating element group is energized, the surface of the inner plate 8 is kept at about 40 to 50°C.

The exothermic resin laminate 7 of this example described above is manufactured by the following method. That is, first, the inner plate 8 and the outer plate 9
and are respectively formed into curved surfaces to match the shapes of the "seat part" and "backrest part" of the bench of the target article. Then, on one side of the solidified inner plate 8, a group of heating elements having a desired shape and having carbon fibers 2 sealed therein in a desired arrangement configuration is pasted with a flexible epoxy resin adhesive 11. At the same time, the other side of the inner plate 8, which becomes the surface of the chair, is coated with a surface material such as Geum Coat. Next, the inner plate 8 and the outer plate 9 to which the heating element 1 is fixed are laminated together with a urethane foam interposed therebetween, and the urethane foam is foamed at room temperature to form a heat insulating layer 10. At the same time as solidifying, the heating element body 1 and the outer panel 9 are integrally bonded to the heat insulating layer 10 and molded.

The heating element 1 having the above structure is made of conductive carbon fiber! 12: - Good adhesion to the base material and does not contain volatile substances - Low shrinkage and creep, excellent shape stability, good thermal resistance and resistance - Excellent electrical insulation and moisture resistance It is made of a flexible film sealed with a flexible epoxy resin that has excellent physical properties such as 1. In addition, it becomes a flexible, high-quality film-like heating element, and is moldable in that its shape and dimensions can be arbitrarily selected.

The heat-generating resin laminate 7 having the heat-generating element 1 as a core can be freely formed into a heat-generating body having a two-dimensional and three-dimensional curved surface by utilizing the flexibility of the heat-generating element 1, and can also be used. There is extremely little risk of cracking or cracking even after repeated heating and cooling, and the function of the heated and insulated product remains durable even when used, for example, on outdoor warming benches or outdoor warmers that are exposed to natural wind and rain. It has a good stabilizing effect.

Therefore, the heat generating element 1 and the heat generating resin laminate 7 of the present invention are as follows:
As exemplified in the attached reference photo, by utilizing the above-mentioned excellent performance, we can produce outdoor thermal benches, thermal tanks, thermal seedling growers,
There is an advantage that it is possible to develop new products such as fermenters, incubators, or "heat-retaining tatami mats in which the heat-generating element 1 is directly inserted on the back side of the tatami surface."

Note that the configuration of the present invention described above is not limited to the above-described embodiment; the heating element body 1 is formed as a film body having an arbitrary shape and size, and the carbon fibers 2 are arranged freely in series or in parallel. , an outdoor heat-retaining bench or the like may have a structure that provides the heat-retaining and heating effect necessary for the article.

In addition, the inner plate 8 and outer plate 9 of the heat-generating resin laminate 7 may be made of materials that satisfy mechanical properties depending on the intended use, and may be made of the above-mentioned FRP.
Alternatively, a normal resin plate may be used and the thickness may be changed arbitrarily, and the heat insulating layer 10 may be omitted to provide a double-sided heat generation structure depending on the application.

"Effects of the Invention" As explained above, the heat generating element of the present invention and the heat generating resin laminate using the same enable the molding of a heat generating element with a two-dimensional three-dimensional curved surface and a heat generating heat-retaining device. For the new development and performance improvement of outdoor heating benches and other heating devices that have moldability, excellent thermal stain resistance, moisture resistance, and electrical insulation properties, and are durable and functionally stable. There are many benefits to contribute.

[Brief explanation of drawings]

Claims (2)

[Claims] (1) Ribbon-shaped carbon fiber groups are freely arranged in series or parallel, and the carbon fiber groups are provided with conductive terminals, and further, the carbon fiber groups are arranged so that only the conductive terminals are left. A heating element characterized by a flexible film-like structure sealed with a flexible epoxy resin. (2) An inner plate and an outer plate made of synthetic resin are laminated and fixed together on both sides of a flexible film-like heating element, and the heating element has a group of ribbon-shaped carbon fibers arranged in series. Alternatively, the carbon fiber groups are freely arranged in parallel, and the carbon fiber groups are provided with conductive terminals, and further, the carbon fiber groups are sealed with a flexible epoxy resin, leaving only the conductive terminals. A heat-generating resin laminate featuring a structure that